The Current Rate Of Groundwater Recharge

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Estimation the current rate of groundwater recharge [1] is essential for efficient groundwater resource management in arid and semi-arid zones, and is often the key to economic development. Moreover, it represents an essential component in the understanding of hydrogeologic settings for the aquifers. Many studies have been proposed to assess recharge with physical and chemical techniques, as well as with modeling [2-5]. These methods, however, are difficult to apply to regional scale studies, and may have a low confidence of model parameters when estimating recharge at a regional scale. Several studies have used the monthly solutions of the Earth’s gravity field produced by the Gravity Recovery and Climate Experiment (GRACE) mission [6] to detect mass variations at and below the surface of the Earth [7]. Global scale water mass variabilities have been estimated [8, 9] based on GRACE data. It has been used successfully to estimate basin-scale water balance [10, 11] and to quantify water mass storage variations [12]. For instance, regional water storage variabilities were estimated in several river basins [10, 11, 13-17]; regional anthropogenic effects were investigated [12, 18-20]; the time-dependent water partitioning in Africa watersheds were studied with other traditional data sets [21]; the anthropogenic induced variations in water availability across Africa was detected [20]; and the human contribution to groundwater depletion in the Middle East were estimated [22]

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